解决Ubuntu16.04 pip报错 ImportError:

1.背景

ubuntu16.04的系统,使用pip命令时提示

DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020.
Please upgrade your Python as Python 2.7 won't be maintained after that date. 
A future version of pip will drop support for Python 2.7.
Requirement already satisfied: lolcat in /usr/local/lib/python2.7/dist-packages (0.44)

于是就升级python的版本到3.5,升级完成后,也将系统默认的python改为python3.5版本的,一切OK之后
重新使用pip安装文件,就报错

Traceback (most recent call last):
   File "/usr/local/bin/pip", line 7, in <module>
     from pip._internal import main
ImportError: No module named 'pip'

2.解决

curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py

由于我将升级的3.5版本的python作为默认版本,所以直接使用了python这个命令

python get-pip.py --force-reinstall

如果默认的python版本为python2版本,使用以下命令

python3.5 get-pip.py --force-reinstall